Staten Island Advance/Michael OatesEric Bellucci is led out of state Supreme Court in St. George, earlier this year.

STATEN ISLAND, N.Y. -- The Annadale man accused of butchering his parents with a hunting knife last year had a meltdown outside court yesterday, proclaiming he was the “Son of Sam” and screaming at a detective who worked on his case.

“Why did you lie to get a warrant?,” Eric Bellucci hollered as he was led off a Correction bus outside state Supreme Court, St. George, according to a law enforcement source. “Your badge is mine!”

Moments earlier, Bellucci, 31, had yelled, “I’m the Son of Sam,” referring to David Berkowitz, the infamous murderer of more than three decades ago who claimed that a demon in possession of his neighbor’s dog had commanded him to kill.

Bellucci also made a reference to the Taliban before officers escorted him to a holding cell inside the building, said the source.

“He was very forceful and looked very menacing,” the source said.

It was a different story about 40 minutes later in the courtroom.

Bellucci said nothing during a brief proceeding before Justice Leonard P. Rienzi.

Garbed in a black shirt and blue sweat pants, the suspect appears noticeably thinner than when he was arrested last year, and had some of his shoulder-length dark hair pulled into a ponytail.

Bellucci was confined to upstate Mid-Hudson Forensic Psychiatric Facility in late April after Rienzi deemed him mentally incompetent to stand trial. The judge’s ruling was based on the evaluations of two court-appointed psychiatrists. Prosecutors, who had their own psychiatrist examine the suspect, didn’t dispute those findings.

Family members and law enforcement sources say Bellucci suffers from schizophrenia and is delusional and prone to violent outbursts.

Sources said it is not uncommon for suspects treated at secure psychiatric centers ultimately to be declared fit for trial.

Outside court, Fonte said he’s still reviewing the psychiatric exams.

“I’ve not made a decision on whether or not to confirm the report,” he said.

Bellucci will be arraigned on charges to include first- and second-degree murder if Fonte does not contest the latest findings.

If Fonte challenges them, a hearing will be held to determine Bellucci’s trial fitness. Fonte said he could have Bellucci re-examined by his own doctor at any time, but has not yet decided whether to do so.

Bellucci can’t be arraigned until the court deems him mentally competent, said a spokesman for District Attorney Daniel Donovan.

Rienzi had ordered the original evaluations in December, when the suspect grew uncooperative while awaiting his arraignment. Bellucci had refused to be fingerprinted, and would neither enter the courtroom nor speak to his lawyer.

At Fonte’s request, the judge yesterday ordered that Bellucci be placed in protective custody.

Outside court, the lawyer said he made the request “out of an abundance of caution,” but declined to elaborate.

Fonte said he couldn’t comment on Bellucci’s outburst on the Correction bus, saying he wasn’t present.

Asked if Bellucci has been cooperative, the lawyer said, “Lately, yes.”